United States vs Organization of American States

United States and Organization of American States both are nouns.

Word	Noun	Adjective	Verb	Adverb
United States	Yes	No	No	No
Organization of American States	Yes	No	No	No

United States (noun)	Organization of American States (noun)
the executive and legislative and judicial branches of the federal government of the United States	an association including most countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776